-fairfield



2 Shets- Sheet" 1. G. A. FAIRFIELD.

Sewing-Machine Feed.

i atented March 26, 1867;

I No. 63,149.

ER. WASHINGTON. D. c.

NIEIERS. PNOTO-LITHOGRAPM 2 Sheets-Sheet 2.

A a. A. -FAIRFIELD. Sewihg-Machine Feed.

' Patented March 26,1867.

Quit-chemise gaunt {fits IMPROVEMEN IN FEEDING unomrsu FOR sswme moms.

fitlge fiztrtnlr norm in it their hitters haunted making out ntflge sameTo ALL WHOM 11 MAY oononnn: I

Be it known that I, GEORGE A. FAIRFIEni), of Hartford, in the county ofHartford, and State ofOonnem ticut, have invented certain newand: usefulimprovements in Sewing Machines and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionandoperation thereof, reference being had to the accompanying drawings, andto the lettei's-of-reference marked thereon.

- Figure 1 is a front elevation of theimproved sewingv machine, showingthe several parts of the improved feed apparatus, as well as theparts-for throwing the shuttle. I i I Figure 2 is a sideelevation of themachine, showing the same parts as 1, also the take-up wire and spring.Figure 3'is a horizontal view of the shuttle-carrier detached.

Figure 4 shows a top and side view of the take upwire spring.

PP'is the plate to which the several parts of the machine are attached.A is thearm giving motion to the needle-bur B, and operating th ,utake-up wire w. sis the tak wi ring, held in its place by'the screw. on.R is part of the frame to which theabove p-artsare attached. D is arotating shaft carrying the crank G, which moves the shuttle carrier G,by means of the connecting-rod E, and the arm F. H is an eccentric fixedupon the shaft D, acting by means of the eccentric-strap I, upon thelever K, which rocks the feed-shaft Ii. This shaft carries. the feed-camM, fixed upon its forward end. This cam is curved at the top eccentricto its centre of motion, having hooks at the ends, betweenwhichmovcs-th'e pin'j), attached to the feed-bar N. The feed-bar N isfirmly connected to the feed-block O, and moves between slides P P. Atone end it has a slot, cl, through which passes the screw-pin allowing ahorizontal motion of the length of the'slot. I At the other end itrests, by means of the pin 10, upon the curved upper surface of the earnM. t is a spring pressing the feed-barN downward against itsabove-mentioned supports, The lever K passes through a socket or box inthe shaft L, and is furnished at its lower end with two'screw-nuts, T T,for lengthening or shortening that part of the lever above the shaft L.I The upper nut is held against the box at the end of the-feed-shaft bymeans of the. spiral spring S, thelower nut serving toclamp the upperone when in.the. desired position. The parts of Y the machine notshownin the drawings may be of. any ordinary construction that willproduce the required up and-down motion of the needle-bar B, and therotary motion of the'shafit D.

My invention consists, first, of the-peculiar arrangement andconstruction of theparts:producingthefeed motion and regulating thelength of the stitch. i

i The operation of the-improved feed is as follows r In the drawings theposition of the several parts shown is when the feed-bar is drawn backto its fullest extent, and the feed is ready to rise and move forwardfor another stitch. The shaft D moving in the direction of the arrow, bymeans .of the eccentric H and strap I, the top of the lever K is movedto the left, (fig. 1.) This acts, through theffeed-shaft L, to move thecurved upper surface of the cam M in the samedirection. v As thecammoves the'pin'p rises'alongits surface until it comes in contact withthe hook a. By this motion the feed 0 is raised to the proper positionfor taking hold of the work being sewed by the machine. The cam Mcontinuing its motion in the same direction, the hook a then takes-holdof the pin 9 and carries it forward until the eccentric Hhas moved to aposition opposite to that shown in the.drawin'gs, when the cam M hasreached its farthest limit. to the 1eft. The feed 0 has then'udv'ancedthe" length of .the stitch. The eccentric H continuing its revolution,now moves the top of the -cam M to the right. The pin 1 leaves the hookat and movesdownward, under the pressure of the spring it, along thecurved upper surface of the cam-M, which passes under it.until it comesin contact with the hook I). This motion drops the feed-bar N andthefeed O, and detaches it from the work. The cam M continuing itsmotion, the hook I) then takes hold upon the pin n and carries itbackward to the point of starting, in the position shown -in.the

drawings. The length, of the stitch is regulated by the screw-nuts T T,by which the length of the regulating lever K is adjusted. The shorterthe arm of the lever is made, the greater will be the angulardistancethrough which the cam M is moved by' the revolution of the.ec'cent ricH. It will be observed that a eertain'definite part I of the movementofthe cam M is taken to raise and lower the feed-bar N. The rest of itsmotion controlsthe horizontal movement of the feed-bar N, and affectsthe length of the stitch. The shuttle-carrier G, which is attached tothe arm '11, and operated by the crank O, is constructed of one piece ofmetal punched out of a sheet of the proper thickness, and then struck upto the proper form by means oi. dies, instead of being cast or formed oftwo or more pieces, as is usually the case in other machines. It isattached by screws to the arm F, afterbein g completed. The form of theshuttle-carrier, with the parts g, for driving the shuttle, isshowr r infigs. 2 and 3. The shuttle, is omitted in the. drawings, to show theparts more clearly. The shuttle-race, T41;

is cut through the plate of'the machine from side to side, allowing theshuttle-carrier to be inserted' and retained in the grooves without theaid of a gib or cap usuallypla-ced under the plate, and attached to'itby'serews lengthwise of the shuttle-race to retain the carrier initsplace. The hold-up wire"spring 3, figs. 2 and 4, is constructed asfollows At the rear end of the spring, where it is'attached to the frameof thelmachine,'i t is coiled into a spiral, 0, having the end fturnedout at right angles to form'ajpin for fixing the spring inv position.This spiral part of the spring is inserted into a cavity formed 'toreceive it in the arm R of the machine, and is heldin its place by meansof the screw m. The bottom of this cavity'orreceptacle has a number ofsmall holes, 72 it, around its edge, to receive the pinftofthe spring.The operation of the spring 8 is as follows: It is placed in thereceptacle with :the pointf in one of the holes it; the screw m is theninserted and the spring hooked under the held-up wire in the usualmanner. Any required degree of stiffness of the spring can be given byplacing the point f in the different holes'k, in" the bottom of thereceptacle, so as: to bend itdown more or less before being hooked underthe fhold-up wire, according-as greater or less tensiouof the spring isdesired. I I

Claim. 1

What I claim as my invention, and desire to secure by Letters Patent,is- I .The combinationof the eccentric H, operating upon a regulatinglever K, roeking-shat't'L, cam M, and feed-bar N, or their equitalentytoproduce a four-motion feed, substantially as described.

I also claimthe cam M, having an. eccentric surface whereby thefeed-ba-risraised and dropped, and hooks or stops for producing a horizontalmotion in the feed-bar. I

' G. A. FAIRFIELD'.

I Witnesses:.

HENRY YWATKINSON, Tune. G. ELLIS.

